Official online RPM package browser / search for CentOS [closed]
Solution 1:
Per my comment, I don't believe there is an equivalent to the "packages.debian.org" central package archive (with web interface) in CentOS.
It's something I think is really missing!
Solution 2:
https://pkgs.org/ provides a "Linux Packages Search" for several distributions, including CentOS 5–7.